Sir that 4 cylinder theory is only good on paper.
Toyota 1KR is the most smooth, efficient and environment friendly engine this side of the continent apart from the VW 1.4L TSI which is much expensive to built.
G13 has nothing to write about, here since the 89 JDM Swift, cannot compare it with even a Honda D13b carby or Toyota A series.
No one buys car for engine only else the Altis would be selling 5,000 cars a month and XLi 40 cars a month, in reality it is the other way round.
The 2nz Fe are paired with M/T only, anyone can compare an XLi with a M/T Vitz or Belta on petrol and see what happens.
The belta only runs on SIS CNG kit or else the engine will stall periodically and check engine light will glow.